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d in (-oo:+oo)
(-1/8)*d+7 = 16 // - 16
(-1/8)*d-16+7 = 0
-1/8*d-9 = 0 // + 9
-1/8*d = 9 // : -1/8
d = 9/(-1/8)
d = -72
d = -72
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